Final answer:
The statement that enzymes catalyze multiple chemical reactions and link metabolic pathways in cells is true. Enzymes facilitate anabolic and catabolic reactions within metabolic pathways and may regulate metabolic flow through allosteric regulation, adapting to the cell's needs.
Step-by-step explanation:
True or False: Enzymes that catalyze two or more chemical reactions link metabolic pathways in cells. This statement is true. Enzymes are central to facilitating the chemical reactions of metabolic pathways.
These pathways can be either anabolic, where small molecules are assembled into larger ones with the input of energy, or catabolic, where large molecules are broken down into smaller ones, releasing energy.
Enzymes not only catalyze individual reactions but also have the capability to regulate the flow of metabolites through these pathways. In some instances, enzymes can act on multiple substrates and perform various reactions, effectively linking different metabolic pathways.
Moreover, enzymes can be subject to allosteric regulation, which allows their activity to be finely tuned in response to the needs of the cell.
For example, the presence of ATP, ADP, AMP, NAD+, and NADH can increase or decrease enzyme activity, thus controlling metabolic flow. This ensures a highly regulated and interconnected network of biochemical reactions that maintain cellular homeostasis.